Tool



1935- c. L. ERICKSON ET AL 2,011,622

TOOL 7 Filed July s,- 1933 CLEr/aaoza W6 Pa/wcfiezbkr INVENTORJ ATTORNEY.

' the supporting portion of the tool Patented Aug. 2.0, 1935 i ETED 3TH? aeiiszz TOOL Chester L. Erickson,

East Milton, Henry G.

Lambert, Mattapan, and Walter A. Patscheider, Auburndale, Mass, assignors to Walworth Patents Inc., Boston, Mass, a corporation of Massachusetts Application July 8, 1933, Serial No. 6793540 4 Claims.

This invention relates to gripping tools, such as wrenches, Vises and the like and more particularly to improvements in removable jaw faces therefor.

Gripping tools of the class described are often provided with one or more detachable jaw faces in which the gripping teeth are formed, so that when the teeth become worn or broken the jaw face can be discarded and a new one inserted in the tool. The usual means of retaining the jaw face in the tool is by means of a rivet or pin which is inserted through both thejaw face and upon which the jaw face is seated;

The jaw faces of these gripping tools are required to withstand considerable thrust during the use ofthe tool, which in the case of wrenches and like tools subjected to a turning force, tends to displace the jaw face from-its seat. It will be apparent that if this thrust is taken solely by the retaining pin the life of this member will be short. This is a common source of failure in tools of this description and is the cause of much annoyance and expense to those concerned.

An object of this invention is to relieve the jaw face holding pin fromstrain.

"Another object of this invention is to carry the load placed upon the jaw face upon. means which will be strong] enough to withstand it.

Another object of the invention is'to prevent unauthorized movement. of the jaw face on its seat.

Another object of the invention is to insure ready removal of the jaw face when desired.

Another object of the invention is to form the jaw' face in one piece which can readily and inexpensivelybe manufactured.

Otherobjects and advantages will become apparent from the following description taken in connection. with r the accompanying drawing wherein: 1 i I l is a front elevation of a pipe wrench showing the stationary jaw portion partly in section with the improved jaw face in position. Fig. 2 is an enlarged fragmentary frontelevation partly in section of the stationary jaw shown in Fig. 1 with the jaw face separated therefrom.

Fig. 3 is a section taken on the line 3-3 of Fig. 1' looking in the direction indicated by the arrows.

' Fig. 4.is a section taken on the line 4-4 of Fig. 3 looking in the direction indicated by the arrows and Fig. 5 is a'perspective view of the jaw face.

Although this. invention is shown and will be described in connection with a pipe wrench it will be understood that this is merely for the purpose of illustration and that the invention is not limited to tools of this class but may be applied with equal facility to other types of wrenches, 5 visas and the like with or without minor changes in construction falling within the scope of appended claims. z

Referring more particularly to the drawing, the pipe wrench shown as a. whole in Fig. l is of the well known Walco type constructed in accordance with the teachings of Brungardt Patent No. 1,862,002. Accordingly, the wrench. is provided with a bar portion l having an integral frame v H! for the reception of a movable-jaw i l. The movable jaw. Hi may be adjusted relatively to the bar In by means of a nut I6 and is positioned Within the frame l2 by means of a spring 118 which in the gripping positionof the movable jaw is adapted to be housed within a slot 28 formed along the inner side of the bar ii]. The usual teeth l are formed in the movable jaw It as shown. l

The bar It! is further provided with a stationary jaw 22 which in the aforementioned Brungarclt patent had gripping teeth formed directly therein. However, as this present invention contemplates the provision of a detachable jaw face for the stationary jaw 22; these gripping teeth are not formed directly in the bar but the end surface of the jaw 22 is provided with a flat seat 26. In order to retain the conventional angle between the stationary and movable jaws the seat 24 is inclined with reference to the length of the bar as shown in Fig. 1. On the flat seat thus formed is seated the detachable jaw face designated by the numeral 26. In accordance with this invention means are provided to support the detachable jaw face 26 against displacement under load and to relieve from strain the means holding said jaw face in position. To this end, seat 24 is provided with a cruciform recess comprising a slot 30 extending across the width of the seat 24 and a slot 32 extending from the outer edge 34 of the jaw 22 partly across the length of the seat 24. The slot 32 is interrupted by a recessed portion 28 having in this instance, flat sides 36 converging toward and bounded by a concave bottom surface 38, which extends into the seat 24 adjacent the inner side of the bar as shown clearly in Fig. 2. It will be apparent that the slots 30 and 32 formthe arms of the cruciform recess and that the arm formed by the slot 32 is deeper v OI ing a cruciform recess therein, said projecting portion having cruciform arms closely engaging the sides of the recess, one of said arms and its complemental recess extending laterally of said seating surfaces and thus transversely of the direction of the force which in normal use tends to slide the jaw face across the sealing surface of the jaw, and means extending parallel to the arm and recess for securing the face on the seating surface of the jaw, said means being relieved of stress during normal use by the aforementioned engagement of said arm and recess.

CHESTER L. ERICKSON. WALTER A. PATSCHEIDER;

HENRY G. LAMBERT. 

